78 lines
2.2 KiB
C++
78 lines
2.2 KiB
C++
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// Copyright 2017 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/metrics/single_sample_metrics.h"
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#include "base/memory/ptr_util.h"
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#include "base/metrics/histogram.h"
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namespace base {
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static SingleSampleMetricsFactory* g_factory = nullptr;
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// static
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SingleSampleMetricsFactory* SingleSampleMetricsFactory::Get() {
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if (!g_factory)
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g_factory = new DefaultSingleSampleMetricsFactory();
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return g_factory;
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}
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// static
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void SingleSampleMetricsFactory::SetFactory(
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std::unique_ptr<SingleSampleMetricsFactory> factory) {
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DCHECK(!g_factory);
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g_factory = factory.release();
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}
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// static
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void SingleSampleMetricsFactory::DeleteFactoryForTesting() {
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DCHECK(g_factory);
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delete g_factory;
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g_factory = nullptr;
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}
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std::unique_ptr<SingleSampleMetric>
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DefaultSingleSampleMetricsFactory::CreateCustomCountsMetric(
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const std::string& histogram_name,
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HistogramBase::Sample min,
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HistogramBase::Sample max,
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uint32_t bucket_count) {
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return std::make_unique<DefaultSingleSampleMetric>(
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histogram_name, min, max, bucket_count,
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HistogramBase::kUmaTargetedHistogramFlag);
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}
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DefaultSingleSampleMetric::DefaultSingleSampleMetric(
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const std::string& histogram_name,
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HistogramBase::Sample min,
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HistogramBase::Sample max,
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uint32_t bucket_count,
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int32_t flags)
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: histogram_(Histogram::FactoryGet(histogram_name,
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min,
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max,
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bucket_count,
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flags)) {
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// Bad construction parameters may lead to |histogram_| being null; DCHECK to
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// find accidental errors in production. We must still handle the nullptr in
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// destruction though since this construction may come from another untrusted
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// process.
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DCHECK(histogram_);
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}
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DefaultSingleSampleMetric::~DefaultSingleSampleMetric() {
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// |histogram_| may be nullptr if bad construction parameters are given.
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if (sample_ < 0 || !histogram_)
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return;
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histogram_->Add(sample_);
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}
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void DefaultSingleSampleMetric::SetSample(HistogramBase::Sample sample) {
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DCHECK_GE(sample, 0);
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sample_ = sample;
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}
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} // namespace base
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